import { IsString, IsOptional, IsBoolean, IsArray, IsIn, IsNumber, Min } from 'class-validator';
import { ApiProperty, ApiPropertyOptional } from '@nestjs/swagger';

const poolStrategies = ['least-apps', 'round-robin', 'weighted-round-robin', 'least-loaded', 'weighted-resource', 'region-based'] as const;
type PoolStrategyDto = typeof poolStrategies[number];

export class CreateClusterPoolDto {
  @ApiProperty({ example: 'production-pool' })
  @IsString()
  name: string;

  @ApiPropertyOptional({ example: 'Load-balanced pool for production workloads' })
  @IsOptional()
  @IsString()
  description?: string;

  @ApiProperty({ example: 'weighted-resource', enum: poolStrategies })
  @IsIn(poolStrategies)
  strategy: PoolStrategyDto;

  @ApiProperty({ example: ['uuid-1', 'uuid-2'], description: 'Array of cluster IDs in this pool' })
  @IsArray()
  @IsString({ each: true })
  clusterIds: string[];

  @ApiPropertyOptional({ example: true })
  @IsOptional()
  @IsBoolean()
  isDefault?: boolean;

  @ApiPropertyOptional({ example: 100 })
  @IsOptional()
  @IsNumber()
  @Min(1)
  priority?: number;
}

export class UpdateClusterPoolDto {
  @ApiPropertyOptional({ example: 'production-pool-v2' })
  @IsOptional()
  @IsString()
  name?: string;

  @ApiPropertyOptional()
  @IsOptional()
  @IsString()
  description?: string;

  @ApiPropertyOptional({ enum: poolStrategies })
  @IsOptional()
  @IsIn(poolStrategies)
  strategy?: PoolStrategyDto;

  @ApiPropertyOptional({ description: 'Array of cluster IDs in this pool' })
  @IsOptional()
  @IsArray()
  @IsString({ each: true })
  clusterIds?: string[];

  @ApiPropertyOptional()
  @IsOptional()
  @IsBoolean()
  isActive?: boolean;

  @ApiPropertyOptional()
  @IsOptional()
  @IsBoolean()
  isDefault?: boolean;

  @ApiPropertyOptional()
  @IsOptional()
  @IsNumber()
  @Min(1)
  priority?: number;
}